400011405 has 16 divisors (see below), whose sum is σ = 652095360. Its totient is φ = 209313728.

The previous prime is 400011397. The next prime is 400011439. The reversal of 400011405 is 504110004.

It is a cyclic number.

It is not a de Polignac number, because 400011405 - 2³ = 400011397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250785 + ... + 252374.

It is an arithmetic number, because the mean of its divisors is an integer number (40755960).

Almost surely, 2^400011405 is an apocalyptic number.

It is an amenable number.

400011405 is a deficient number, since it is larger than the sum of its proper divisors (252083955).

400011405 is a wasteful number, since it uses less digits than its factorization.

400011405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503220.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 400011405 is about 20000.2851229676. The cubic root of 400011405 is about 736.8133023914.

Adding to 400011405 its reverse (504110004), we get a palindrome (904121409).

The spelling of 400011405 in words is "four hundred million, eleven thousand, four hundred five".